[PATCH v10 00/12] fprobe: Introduce fprobe function entry/exit probe

Masami Hiramatsu
2022-03-08T11:08:45Z

Hi,

Here is the 10th version of fprobe. In this version, the rethook arm support
([7/12]) comes back :-D, add an internal rethook flag for identify the context
([3-8/12]), and simplifies the ftrace_location lookup loops([2/12]) according
to Jiri's comment :)

The previous version (v9) is here[1];

[1] https://lore.kernel.org/all/164655933970.1674510.3809060481512713846.stgit@devnote2/T/#u

This series introduces the fprobe, the function entry/exit probe
with multiple probe point support for x86, arm64 and powerpc64le.
This also introduces the rethook for hooking function return as same as
the kretprobe does. This abstraction will help us to generalize the fgraph
tracer, because we can just switch to it from the rethook in fprobe,
depending on the kernel configuration.

The patch [1/10] is from Jiri's series[2].

[2] https://lore.kernel.org/all/20220104080943.113249-1-jolsa@kernel.org/T/#u

And the patch [9/10] adds the FPROBE_FL_KPROBE_SHARED flag for the case
if user wants to share the same code (or share a same resource) on the
fprobe and the kprobes.

I forcibly updated my kprobes/fprobe branch, you can pull this series
from:

https://git.kernel.org/pub/scm/linux/kernel/git/mhiramat/linux.git kprobes/fprobe

Thank you,

---

Jiri Olsa (1):
ftrace: Add ftrace_set_filter_ips function

Masami Hiramatsu (11):
fprobe: Add ftrace based probe APIs
rethook: Add a generic return hook
rethook: x86: Add rethook x86 implementation
arm64: rethook: Add arm64 rethook implementation
powerpc: Add rethook support
ARM: rethook: Add rethook arm implementation
fprobe: Add exit_handler support
fprobe: Add sample program for fprobe
fprobe: Introduce FPROBE_FL_KPROBE_SHARED flag for fprobe
docs: fprobe: Add fprobe description to ftrace-use.rst
fprobe: Add a selftest for fprobe

Documentation/trace/fprobe.rst | 171 +++++++++++++
Documentation/trace/index.rst | 1
arch/arm/Kconfig | 1
arch/arm/include/asm/stacktrace.h | 4
arch/arm/kernel/stacktrace.c | 6
arch/arm/probes/Makefile | 1
arch/arm/probes/rethook.c | 101 ++++++++
arch/arm64/Kconfig | 1
arch/arm64/include/asm/stacktrace.h | 2
arch/arm64/kernel/probes/Makefile | 1
arch/arm64/kernel/probes/rethook.c | 25 ++
arch/arm64/kernel/probes/rethook_trampoline.S | 87 +++++++
arch/arm64/kernel/stacktrace.c | 7 -
arch/powerpc/Kconfig | 1
arch/powerpc/kernel/Makefile | 1
arch/powerpc/kernel/rethook.c | 72 +++++
arch/x86/Kconfig | 1
arch/x86/include/asm/unwind.h | 8 +
arch/x86/kernel/Makefile | 1
arch/x86/kernel/kprobes/common.h | 1
arch/x86/kernel/rethook.c | 115 +++++++++
include/linux/fprobe.h | 105 ++++++++
include/linux/ftrace.h | 3
include/linux/kprobes.h | 3
include/linux/rethook.h | 100 ++++++++
include/linux/sched.h | 3
kernel/exit.c | 2
kernel/fork.c | 3
kernel/trace/Kconfig | 26 ++
kernel/trace/Makefile | 2
kernel/trace/fprobe.c | 332 +++++++++++++++++++++++++
kernel/trace/ftrace.c | 58 ++++
kernel/trace/rethook.c | 317 ++++++++++++++++++++++++
lib/Kconfig.debug | 12 +
lib/Makefile | 2
lib/test_fprobe.c | 174 +++++++++++++
samples/Kconfig | 7 +
samples/Makefile | 1
samples/fprobe/Makefile | 3
samples/fprobe/fprobe_example.c | 120 +++++++++
40 files changed, 1867 insertions(+), 14 deletions(-)
create mode 100644 Documentation/trace/fprobe.rst
create mode 100644 arch/arm/probes/rethook.c
create mode 100644 arch/arm64/kernel/probes/rethook.c
create mode 100644 arch/arm64/kernel/probes/rethook_trampoline.S
create mode 100644 arch/powerpc/kernel/rethook.c
create mode 100644 arch/x86/kernel/rethook.c
create mode 100644 include/linux/fprobe.h
create mode 100644 include/linux/rethook.h
create mode 100644 kernel/trace/fprobe.c
create mode 100644 kernel/trace/rethook.c
create mode 100644 lib/test_fprobe.c
create mode 100644 samples/fprobe/Makefile
create mode 100644 samples/fprobe/fprobe_example.c

--
Masami Hiramatsu (Linaro) <mhiramat@kernel.org>